We've had one report of the error Unexpected response to
shell/command request: packet type 95 when connecting to VShell
2.1.5 with PSCP.

Packet type 95 is SSH2_MSG_CHANNEL_EXTENDED_DATA. Perhaps
this is VShell complaining on stderr about a nonexistent SFTP server
subsystem, or similar?

This seems likely to have the same root cause as
`portfwd-at-start': brittle code
at connection startup.

Ref. <5.2.1.1.2.20030706150354.00b4e718@localhost>

SGT, 2004-11-27: I've rearchitected the SSH back end
somewhat, so that it's now a hybrid of coroutine-based sequential
code and random dispatch-table handling of incoming packets. This
ought to solve this problem, although I'm unable to immediately
test it.